Preheat the oven: Set your oven to 425°F (220°C). A hot oven is key for crispy edges.
Prep the pan: Line a large baking sheet with parchment for easy cleanup.
Use a pan big enough so the broccoli isn’t crowded.
Cut the broccoli: Trim the stems and break or cut into even-sized florets. Slice any thick stems into coins—they roast beautifully and add extra texture.
Dry thoroughly: If you washed the broccoli, pat it dry. Moisture prevents browning, so the drier, the better.
Toss with oil and garlic: In a large bowl, combine broccoli, olive oil, and minced garlic. Add salt, pepper, and red pepper flakes if using.
Toss until evenly coated.
Spread in a single layer: Arrange the broccoli on the baking sheet cut-side down when possible. Space is crucial for crisping.
Roast: Bake for 15–20 minutes, stirring once halfway. Broccoli should be browned on the edges and tender in the center.
Add Parmesan: Remove the pan, sprinkle the grated Parmesan evenly, and return to the oven for 2–3 minutes to melt slightly.
Finish: Squeeze a little lemon over the top, toss lightly, and taste for seasoning. Add more Parmesan or a pinch of salt if needed.
Serve: Top with toasted breadcrumbs for crunch if you like.
Serve hot.